Implement Concurrent Any-True Shot

You are given a function `shot(index) -> bool`. Each call may take between 1 and 10 seconds to return. Implement `volleyShot(indices) -> bool` for a list of indices. Requirements: - Start multiple `shot` calls concurrently. - Return `True` as soon as any call returns `True`. - Return `False` only after all calls have completed and every call returned `False`. - If the answer is already known, do not keep waiting for slower calls when the runtime allows best-effort cancellation. - If `indices` is empty, return `False`. The focus is on concurrency and early termination.